EP1480926A2 - Procede pour la production d'engrais granules - Google Patents

Procede pour la production d'engrais granules

Info

Publication number
EP1480926A2
EP1480926A2 EP03739499A EP03739499A EP1480926A2 EP 1480926 A2 EP1480926 A2 EP 1480926A2 EP 03739499 A EP03739499 A EP 03739499A EP 03739499 A EP03739499 A EP 03739499A EP 1480926 A2 EP1480926 A2 EP 1480926A2
Authority
EP
European Patent Office
Prior art keywords
salt
nitrogen
granular
range
alkaline
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP03739499A
Other languages
German (de)
English (en)
Inventor
Vladimir Vasillievich Minaev
Frunzenskaya Vsevolod Nikolaevich Rudin
Petrovich Sobolev Boris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lisopharm AG
Original Assignee
Lisopharm AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lisopharm AG filed Critical Lisopharm AG
Priority to EP03739499A priority Critical patent/EP1480926A2/fr
Publication of EP1480926A2 publication Critical patent/EP1480926A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
    • C05B11/04—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/10—Solid or semi-solid fertilisers, e.g. powders
    • C05G5/12—Granules or flakes

Definitions

  • the invention relates to a method for producing granular fertilisers comprising structural compounds based on at least one salt according to the preamble of claims 1 or 13. Further, the invention relates to a granular fertiliser according to the preamble of claim 34.
  • a mixture of starting materials is obtained.
  • the starting material comprises usually ammonia.
  • the mixture is then heated to a temperature when it starts to melt.
  • the molten starting materials mixture is granulated in a further step.
  • a granular fertiliser is produced.
  • the obtained fertiliser is then cooled, classified and packed.
  • compositions of the fertiliser essentially improve the physico-mechanical properties of the product.
  • One reason for the advantage of the multiple salts is that they contribute to the formation of structural compounds.
  • structural compounds are named that can be different in composition but that can comprise the same substance.
  • water may be such substance that may be present in the crystal lattice of the salt.
  • a further negative result is the limitation of productivity.
  • only a small discharge of ammonia into a gas phase takes place, which causes the necessity of using ammonia saltpetre only as a solution.
  • the capability of obtaining fertilisers with increased concentration of nitrogen and further components is limited.
  • One problem to be solved by the invention is to produce much less limited assortment of granular fertilisers. Another problem to be solved is to lift limitations on the productivity of the technological process. Further, ecological parameters of the production line have to be improved.
  • the solution according to the invention provides for the first time a method for producing granular fertilisers comprising structural compounds based on at least two salts with the steps of disposing of at least one salt comprising nitrogen, humidifying the at least one salt, mixing the at least one humidified salt with at least one substance comprising alkaline and/or alkaline-earth element and/or at least one element of the forth period of group IV, producing a granular fertiliser by granulation of the mixture, and cooling the granular fertiliser.
  • One important advantage of the method is the efficient utilisation of substances based on alkaline, alkaline-earth elements and/or group IV elements. These elements form structural compounds based on at least two salts. Therefore, the method according to the invention provides for realising the desired physico-mechanical properties of the product in a surprisingly simple way.
  • the formation of structural compounds based on at least two salts is accompanied by heat evolution in the chemical process.
  • the multiple salts produced in the exothermic chemical reaction provide for the great advantage of improving the physico-mechanical properties of the fertiliser.
  • the process step of cooling gives possibility of adopting the method in a surprisingly simple way even to extremely different requirements .
  • the method further comprises the step of classification of the granular fertiliser.
  • the invention provides for feeding at least a part of the fine portion obtained by classification back into the process as a so- called recycle.
  • the method according to the invention allows to improve the physico-mechanical properties of the fertilisers in view of a low hygroscopicity and a minor chance of undergoing solidification. Further it is advantageously possible to adjust the ratio and concentration of nutrient elements in the produced fertilisers in a broad range.
  • the granulation itself can be carried out by any known method. If the granulation is carried out in an drum granulator, then the steps of mixing, granulation and cooling may be combined in a single apparatus.
  • the steps of mixing, granulation and cooling can also be carried out in different apparatuses. Already the steps of mixing and granulation can be superimposed by the chemical reaction of forming the granular fertiliser. The actual reaction, however, actively proceeds during the cooling step.
  • the method according to the invention provides for the great advantage of being flexible in view of the starting material.
  • at least one further salt comprising nitrogen can be fed into the process.
  • the at least one salt comprising nitrogen and/or the at least one further salt comprising nitrogen comprise ammonium sulphate and/or ammonium phosphate and/or diammonium phosphate and/or ammonium saltpetre.
  • the advantageous physico-mechanical properties of the product are mainly achieved by forming structural compounds .
  • the invention provides for the humidifying step.
  • " by humidifying the at least one salt comprising nitrogen and/or the at least one further salt comprising nitrogen a solution and/or pulp of salt is produced.
  • the concentration c of the solution and/or pulp comprising the at least one salt comprising nitrogen and/or the at least one further salt comprising nitrogen is equal or greater than 40 wt.-%.
  • the invention provides a humidity ⁇ s of a salt being equal to or greater than 10 wt.-%.
  • the method according to the invention provides for the possibility of reducing the process temperature significantly.
  • the method according to the invention further allows to adopt the product to a broad range of pH values.
  • the invention is not limited to the above described method for producing granular fertilisers starting with disposing of at least one salt comprising nitrogen and humidifying the at least one salt.
  • the invention also provides an alternative method for producing the fertilisers comprising at least one structural compound with the following steps: disposing of at least one mineral substance, de-composing the at least one mineral substance in particular by precipitation using an asset, separating the remaining acidic liquor from the precipitate, ammonising the remaining acidic liquor, adding at least one substance comprising at least one alkaline and/or alkaline-earth element and/or at least one element of the first period of group IV to the ammonised acidic liquor, evaporating the surplus of moisture, producing a granular fertiliser by granulation of the mixture, and cooling the granular fertiliser.
  • the invention advantageously opens up the possibility of practically not being limited in the choice of the starting material.
  • the alternative method of carrying " out the invention can also comprise the further step of classification of the granular fertiliser in order to ensure a predetermined size range of the product. Further, at least a part of the fine portion obtained by classification can be fed back into the process as recycle.
  • the at least one mineral substance can comprise apatite, which is in a surprisingly simple way suited to be used in the above mentioned process.
  • the ratio M of the mass flow of recycle referred to the entire mass flow of the product is equal to or below 40 wt.-%.
  • the method of the invention is, further, not generally limited to the process steps mentioned above.
  • single steps can be carried out more than once.
  • sequence of the process steps may be varied in any desired way.
  • the method according to the invention can comprise a first further step of mixing being carried out after adding the at least one substance comprising an alkaline and/or alkaline-earth element and/or at least one element of the forth period of group IV.
  • At least one further salt can be fed into the process.
  • the at least one further salt comprises carbamide and/or potassium chloride and/or sodium chloride.
  • further nutrients as well as further components forming the structural compounds can be fed into the process while a precise dosage and controlling of the mixture's properties are ensured by feeding several salts each in a single way.
  • a second further step of mixing can be carried out after feeding the at least one further salt into the process.
  • the method according to the invention further provides an additional step of encapsulating the granular fertiliser and/or a further component. By doing so, especially stocking of the unpacked product can advantageously avoided.
  • a further component to be encapsulated can be a granular component itself, in particular, prilled ammonium saltpetre and/or granulated carbamide.
  • a further component to be encapsulated can be a granular component itself, in particular, prilled ammonium saltpetre and/or granulated carbamide.
  • a further possibility provided by the method according to the invention is to feed at least one mineral acid into the process.
  • the at least one mineral acid can comprise sulphuric acid and/or phosphoric acid and/or nitric acid.
  • the pH of the mixture obtained by feeding the at least one mineral acid into the process is controlled by the amount of mineral acid added.
  • a further possibility of designing the method according to the invention in view of the given requirements is to feed water into the process.
  • granulation is carried out by means of humidifying, moistening, respectively, of mixed powder materials with solutions and/or pulps (slurries) .
  • Humidifying may for instance be carried out only with water. However, in this case a large amount of water may be needed resulting in a decrease of the concentrations of principle nutrient elements such as in particular N, P, and K. Therefore, the preferred technological methods for preparing a humidifying agent comprise a preparation of concentrated solutions and/or pulps.
  • solution refers to a solution of, for instance, ammonium saltpetre in water, or ammonium phosphate or ammonium sulphate in water, or ammonium saltpetre, ammonium phosphate, potassium chloride in water, or carbamide, ammonium phosphate in water and so on.
  • this nutrient can comprise calcium, magnesium, iron, sulphur, boron, zinc, copper, manganese, and molybdenum.
  • the product strength depends on the cooling rate of the fertiliser after the granulation stage. Heat produced in the exothermic chemical reaction is dissipated by cooling. Hence, by cooling the formation of structural compounds is encouraged.
  • the invention provides the possibility of storing the product after the production.
  • the method according to the invention can comprise the further step of maturating the product.
  • the maturation time t M is equal to or less than 72 hours.
  • the granular fertiliser according to the invention shows a strength ⁇ being equal to or greater than 3 MPa.
  • the strength ⁇ is the resistance to pressure.
  • the granular fertiliser shows an entire amount c sc of at least one structural component being equal to or greater than 50 wt.-%.
  • the concentration of the structural compounds is given in relation to the theoretical concentration.
  • the theoretical concentration can be calculated according to a chemical formula of the structural compound. For example, as a structural compound (NH 4 ) 2 S0 4 MgS0 4 is produced. This structural compound should incorporate six water molecules. Hence, the quantity of moisture introduced into a process with solutions and/or pulps is known. After carrying out the process the concentration of free moisture in the product is determined. Accordingly, the quantity of the formed structural compounds can be calculated.
  • the structural compound is based on a multiple salt comprising one further substance, in particular water.
  • structural compounds can comprise MgHP0 n H 2 0 and/or NH 4 MgP0 n H 2 0 and/or (NH 4 ) 2 S0 4 Mg 2 S0 4 n H 2 0 and/or NH 4 NaHP0 4 n H 2 0.
  • the granular fertiliser according to the invention further comprises P 2 0 5 and/or K 2 0 and/or S0 3 .
  • Fig. 1 one schematic flow chart of the method according to the invention realised in examples 1 and 2
  • Fig. 2 one schematic flow chart of the method according to the invention realised in examples 3, 4, 5 and 6,
  • FIG. 3 one schematic flow chart of the method according to the invention realised in examples 7, 8, 9, 10,
  • FIG. 4 one schematic flow chart of the method according to the invention realised in examples 13,
  • FIG. 5 one schematic flow chart of the method according to the invention realised in example 14
  • Fig. 6 one schematic flow chart of the method according to the invention realised in example 15.
  • Examples 1 and 2 are illustrated in the flow chart schematically given in figure 1.
  • Example 1 Example 1 .
  • a solution (pulp) on the basis of 17 g of ammonium sulphate with a humidity of 30 wt.-%, a temperature 80°C, pH 1.5, and 29 g ammonia saltpetre with a humidity of 3 wt.-% and a recycle are mixed in the presence of 1.25 g of a substance recalculated for alkaline-earth material.
  • the mixture is granulated at the temperature of 75°C, cooled and classified.
  • a product with a content of 28 wt.-% N, 3.0 wt.-% S0 3 is prepared.
  • the strength ⁇ of the product is not less than 3.0 MPa, pH of the product is not less than 3.5.
  • the concentration of structural compounds is not less than 80 wt.-% from the amount which is theoretically possible.
  • a solution (pulp) based an 17 g of ammonium sulphate with a humidity of 30 wt.-%, a temperature of 85 °C, a pH between 7 and 7.5, and 29 g of ammonia saltpetre with a humidity of 3 wt.-%, and recycle are mixed in the presence of a substance of alkaline-earth material comprising at least one alkaline- earth element taken in quantity 1.4 g recalculated for the given element.
  • the mixture is then granulated at a temperature of 65°C. Afterwards, the granulated product is cooled and classified.
  • a solution (pulp) based an 16 g of ammonium sulphate with a humidity of 30 wt.-% and a temperature of 80°C is mixed with 20 g of ammonia phosphate with pH 7.
  • 16.5 g of carbamide and 16 g of potassium chloride are added.
  • the prepared ingredients are mixed with recycle and granulated at 60 °C.
  • the granulated product is then cooled and classified.
  • the product contains 14 wt.-% N, 14 wt.-% P 2 0 5 , and 14 wt.-% K 2 0.
  • the strength of the product is not less than 3.0 MPa.
  • the pH of a product is 5.
  • the concentration of structural compounds is not less than 93 wt.-% of the amount theoretically possible.
  • 39 g of a pulp of ammonium phosphate with pH 5 and a humidity of 23 wt.-% are mixed with 12 g of carbamide, 17 g of potassium chloride, 28 g of ammonium phosphate with pH 4.5 and the recycle.
  • the ingredients are mixed, granulated at the temperature of 55 °C, cooled and classified.
  • the obtained material comprises 10 wt.-% N, 30 wt.-% P 2 0 5 , and 10 wt.-% K 2 0.
  • the strength of the product is not less than 3.0 MPa
  • the pH of the product is not less than 6.0.
  • the concentration of structural compounds is not less than 85 wt.-% from the amount theoretically possible.
  • the strength of the prepared product is not less than 3.0 MPa, the pH of the product is not less than 6.5.
  • the concentration of structural compounds is not less than 90 wt.-% from the amount theoretically possible.
  • a pulp prepared of 31 g of ammonium phosphate with pH 5 and 7.7 g of water, resulting in a humidity of 20 wt.-%, are mixed with 28 g of potassium chloride, 29 g of carbamide and recycle in the presence of a substance containing 2.9 g of alkaline-earth material comprising at least one alkaline- earth element.
  • the obtained mixture is granulated at a temperature of 50 °C, cooled and classified.
  • the resulting product contains 17 wt.-% of N, 17 wt.-% of P 2 0 5 , and
  • the strength of the product is not less than 3.0 MPa, and its pH is 7.
  • the quantity of the structural compounds is no less than 75 wt.-% of the amount theoretically possible.
  • Example 7 A quantity of 6 g of ammonium phosphate with pH 4.5 is mixed with sulphuric acid up to pH 1.5. Then, 0.6 g of ammonium sulphate is added. 27 g of ammonia saltpetre with a humidity of 3.5 wt.-% and 13.3 g of ammonia saltpetre solution with a concentration of 85 wt.-% are prepared at the temperature of 80°C to 85°C. In the presence of substances with alkaline-earth element taken in quantity 0.8 g recalculated for element, the prepared ingredients and recycle are mixed, granulated at the temperature of 70°C, cooled and classified.
  • the product comprises 27 wt.-% N, 6 wt.-% P205 and 6 wt.-% K 2 0.
  • the strength of the product is not less than 3 MPa, pH of the product is not less than 5.5.
  • the concentration of structural compounds is not less than 75 wt.-% from the amount theoretically possible.
  • a quantity of 58 g of ammonium phosphate pH in the range of 4.5 to 5 is mixed with 5.8 g of sulphuric acid.
  • 18 g of a solution of ammonia saltpetre with a concentration of 55 wt.-% to 60 wt.-% are prepared at a temperature of 90 °C.
  • the prepared ingredients are mixed with 17 , g of potassium chloride and recycle. Then, the mixture is granulated at a temperature of 65 °C.
  • the product comprises 10 wt.-% N, 30 wt.-% P 2 0 5 , and 10 wt.-% K 2 0.
  • Strength of the product is not less than 3.0 MPa, pH of the product is 5.5 to 6.
  • the concentration of structural compounds is not less than 90 wt.-% from the amount theoretically possible.
  • a quantity of 10 g of ammonium phosphate with pH 4.5 to 5 is mixed with 1 g of sulphuric acid.
  • a quantity of 13.3 g of a solution of ammonia saltpetre with a concentration of 85 wt.-% is prepared at a temperature of 75 °C.
  • the prepared ingredients are mixed with 8.7 g of potassium chloride and recycle. Then, the mixture is granulated at a temperature of 40°C.
  • a product comprising 15 wt.-% N, 15 wt.-%P 2 0 5 , and 15 wt.-% K 2 0 is prepared.
  • the strength ⁇ of a product is not less than 3.0 MPa, pH of the product is 6.
  • the concentration of structural compounds is not less than 85 wt.-% from the amount theoretically possible.
  • An amount of 58 g of ammonium phosphate with pH 4.5 to 5 is mixed with 5 g of sulphuric acid.
  • 18 g of a solution of ammonia saltpetre with a concentration of 55 to 60 wt.-% at the temperature of 90 °C are prepared.
  • the produced ingredients are mixed with 17 g of potassium chloride and recycle. Then, the mixture is granulated at a temperature of 70 °C.
  • a product comprising 10 wt.-% N, 30 wt.-% P 2 0s, and 10 wt.-% K 2 0 is prepared.
  • the strength ⁇ of the product is not less than 3 MPa
  • pH of the product is 6.5 to 7.
  • the concentration of structural compounds is not less than 98 wt.-% from the amount theoretically possible.
  • a quantity of 19.2 g of ammonium phosphate with pH of 4.5 to 5 is mixed with 1.9 g of sulphuric acid.
  • 30 g of a solution of ammonia saltpetre and ammonium sulphate with a concentration of 87 wt.-% is prepared at a temperature of 80 °C.
  • the prepared ingredients are mixed with 50 g of potassium chloride and recycle. Then, the mixture is granulated at a temperature of 60°C, cooled and classified.
  • a product comprising 10 wt.-% N, 10 wt.-% P0 5 , and 30 wt.-% K 2 0 is obtained.
  • the strength ⁇ of the product is not less than 3.0 MPa, pH of the product is not less than 5.5.
  • the concentration of structural compounds is not less than 83 wt.-% referred to the amount theoretically possible.
  • a solution of ammonium saltpetre is prepared of 11.3 g of ammonium saltpetre, 1 g of ammonium sulphate and 2 g of water.
  • the solution is mixed with 10 g of ammonium phosphate with a pH of 5, 8.6 g of potassium chloride in the presence of a substance containing 0.55 g of alkaline-earth material comprising at least one alkaline-earth element and recycle.
  • the prepared mixture is granulated at a temperature of 60 °C, cooled and classified.
  • the resulting product contains 15 wt.-% of N, 15 t.-% of P 2 0 5 , and 15 wt.-% of K 2 0.
  • the strength ⁇ of the product is no less than 3.0 MPa and its pH is 6.
  • the quantity of the structural compounds is not less than 85 wt.-% of the amount theoretically possible.
  • a pulp is prepared from 2.5 g of ammonium phosphate with a pH of 7, 1.6 g of sulphuric acid, 6 g of carbamide, 1 g of ammonium sulphate and 1.5 g of water in presence of a substance containing 0.4 g of alkaline-earth element.
  • the pulp is supplied for mixing with 7.5 g of diammonium phosphate, 7.6 g of potassium chloride and recycle.
  • the material produced is granulated at a temperature of 70 °C, cooled and classified.
  • a product containing 16 wt.-% of N, 16 wt.-% of P 2 0 5 , and 16 wt.-% K 2 0 is prepared.
  • the strength ⁇ of the product is not less than 3.0 MPa, pH of the product is 6.
  • the concentration of the structural compounds is not less than 75 wt.-% of the amount theoretically possible.
  • a pulp is prepared of 7.5 g of diammonium phosphate, 2.2 g of sulphuric acid, 1.5 g of sodium chloride, 20 g of ammonium saltpetre, 2.5 g of water and recycle in the presence of substance containing 0.5 g of alkaline-earth element.
  • the pulp is supplied for mixing and granulation with prilled ammonium saltpetre.
  • Encapsulating is performed at a temperature of 75 °C.
  • the material produced is cooled and classified. As a result, a product comprising 30 wt.-% of N, and 5 wt.-% of P 2 Os is obtained.
  • the strength ⁇ of the product is not less than 3 MPa, its pH is 5.
  • the concentration of the structural compounds is not less than 70 wt.-% of the amount theoretically possible.
  • example 15 The method carried out to realise example 15 is illustrated by the schematic flow chart depicted in figure 6.
  • a quantity of 43 g of apatite is decomposed with 62.5 g of nitric acid.
  • the formed calcium nitrate is separated.
  • the produced acidic liquor is ammonised to pH 2.5 to 3.5.
  • the ammonised acidic liquor is evaporated.
  • it is granulated with recycle and 25.4 g of potassium chloride at a temperature of 90 °C, cooled and classified.
  • the resulting product comprises 15 wt.-% N, 15 wt.-% P 2 0 5 , and 15 wt-% K 2 0.
  • the strength ⁇ is not less than 3.0 MPa, the pH of the product is not less than 5.
  • the quantity of the structural compounds is not less than 80 wt-% of the amount theoretically possible.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Fertilizers (AREA)
  • Compounds Of Iron (AREA)

Abstract

L'invention vise notamment à améliorer les propriétés physico-mécaniques d'engrais granulés et à augmenter l'efficacité de l'application d'éléments alcalins, alcalino-terreux et du groupe IV de la classification. A cet effet, l'invention concerne un procédé pour la production d'engrais granulés contenant au moins un composé structurel à base d'au moins un sel, ce procédé comprenant les étapes suivantes : mise à disposition d'au moins un sel contenant de l'azote ; humidification de ce sel ; mélange du sel humidifié avec au moins une substance contenant au moins un élément alcalin, alcalino-terreux ou de la quatrième période du groupe IV de la classification périodique des éléments ; production d'un engrais granulé par granulation du mélange et refroidissement de l'engrais granulé. L'invention concerne également un engrais granulé contenant de l'azote et ayant un pH compris entre 3 et 7. L'engrais granulé selon l'invention a une résistance σ égale à 3 Mpa et une quantité totale csc d'au moins un composé structurel égale à 50 % en poids.
EP03739499A 2002-02-18 2003-02-18 Procede pour la production d'engrais granules Ceased EP1480926A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03739499A EP1480926A2 (fr) 2002-02-18 2003-02-18 Procede pour la production d'engrais granules

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP02003715 2002-02-18
EP02003715 2002-02-18
EP03739499A EP1480926A2 (fr) 2002-02-18 2003-02-18 Procede pour la production d'engrais granules
PCT/EP2003/001593 WO2003068710A2 (fr) 2002-02-18 2003-02-18 Procede pour la production d'engrais granules

Publications (1)

Publication Number Publication Date
EP1480926A2 true EP1480926A2 (fr) 2004-12-01

Family

ID=27675628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03739499A Ceased EP1480926A2 (fr) 2002-02-18 2003-02-18 Procede pour la production d'engrais granules

Country Status (4)

Country Link
US (1) US20050138979A1 (fr)
EP (1) EP1480926A2 (fr)
AU (1) AU2003211718A1 (fr)
WO (1) WO2003068710A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1804209B (zh) * 2004-09-13 2010-05-05 葛文宇 零排放无污染的生态纸浆组合生产工艺
CN100354235C (zh) * 2006-04-06 2007-12-12 潍坊昌大肥料有限公司 一种复合肥的喷浆造粒方法
US10633299B2 (en) 2018-04-23 2020-04-28 Compass Minerals Usa Inc. Time-release molybdenum fertilizer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB426472A (en) * 1932-06-30 1935-04-01 Uhde Gmbh Friedrich Improvements in and relating to the production of granulated materials
GB2237800A (en) * 1989-11-11 1991-05-15 Willett & Son Fertilizer particle and method of preparation
NL1014355C2 (nl) * 2000-02-11 2001-09-07 Dsm Nv Werkwijze voor de bereiding van nutrientgranules.
EP1174402A1 (fr) * 2000-07-04 2002-01-23 Agra Dünger GmbH Procédé de production d'un engrais

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03068710A2 *

Also Published As

Publication number Publication date
WO2003068710A3 (fr) 2004-01-22
WO2003068710A2 (fr) 2003-08-21
AU2003211718A1 (en) 2003-09-04
US20050138979A1 (en) 2005-06-30

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